<template>
    <div class="params">
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 头部的警告区域 -->
            <el-alert
                title="只允许为第三级分类设置相关参数"
                type="warning"
                :closable="false"
                show-icon>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类:</span>
                    <!-- 级联选择器 -->
                     <el-cascader
                        expand-trigger="hover"
                        v-model="selectedCateKeys"
                        :options="cateList"
                        :props="cateProps"
                        @change="handleChange">
                        </el-cascader>
                </el-col>
            </el-row>
            <!-- tab 页签区域 -->
             <el-tabs v-model="activeName" @tab-click="handleTabClick">
                 <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addParamsDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数的表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditParamsDialog(scope.row.attr_id)">修改</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only"> 
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addParamsDialogVisible=true">添加属性</el-button>
                     <!-- 静态属性的表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                       <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditParamsDialog(scope.row.attr_id)">修改</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
            :title="'添加'+titleTexe"
            :visible.sync="addParamsDialogVisible"
            width="50%"
            @close="addParamsDialogClosed">
            <el-form :model="addParamsForm" :rules="addParamsRules" ref="addParamsRef" label-width="100px">
                <el-form-item :label="titleTexe" prop="attr_name">
                    <el-input v-model="addParamsForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addParamsDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParamsConfirm">确 定</el-button>
            </span>
        </el-dialog>
         <!-- 修改参数的对话框 -->
        <el-dialog
            :title="'修改'+titleTexe"
            :visible.sync="editParamsDialogVisible"
            width="50%"
            @close="editParamsDialogClosed">
            <el-form :model="editParamsForm" :rules="editParamsRules" ref="editParamsRef" label-width="100px">
                <el-form-item :label="titleTexe" prop="attr_name">
                    <el-input v-model="editParamsForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editParamsDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParamsConfirm">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return{
            // 商品分类列表数据
            cateList:[],
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 级联选择框的配置项
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 被激活的页签名称
            activeName:'many',
            // 动态参数的数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 控制添加参数对话框的显示与隐藏
            addParamsDialogVisible:false,
            // 添加参数的表单数据对象
            addParamsForm:{
                attr_name:''
            },
            // 添加表单的验证
            addParamsRules:{
               attr_name:[
                   {required:true,message:'请输入参数名称',trigger:'blur'}
               ] 
            },
            // 控制修改参数对话框的显示与隐藏
            editParamsDialogVisible:false,
            // 修改参数的表单数据
            editParamsForm:{},
            // 修改参数表单的验证
            editParamsRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有的商品分类列表
        async getCateList(){
            const {data:res}=await this.$http.get('categories');
            // console.log('获取所有的商品分类列表的请求',res);
            if(res.meta.status!==200) return;
            this.cateList=res.data;
            // console.log(this.cateList)
        },
        // 级联选择框变化会触发这个函数
        handleChange(){
            // console.log('selectedCateKeys',this.selectedCateKeys)
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData(){
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[];
                // this.manyTableData=[];
                // this.onlyTableData=[];
                return
            }
            // 根据所选分类的id,和当前所处的面板，获取对应的参数
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            console.log('选分类和面板发起的请求',res);
            if(res.meta.status!==200) return;
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[];
                // 控制文本框的显示与隐藏
                item.inputVisible=false;
                item.inputValue=''
            })
            // console.log(res.data)
            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        },  
        // tab页签点击事件的处理函数
        handleTabClick(){
            // console.log('activeName',this.activeName)
            this.getParamsData()
        },
        // 监听对话框的关闭事件
        addParamsDialogClosed(){
            this.$refs.addParamsRef.resetFields()
        },
        // 添加参数确定
        addParamsConfirm(){
            this.$refs.addParamsRef.validate(async valid=>{
                // console.log(valid)
                if(!valid) return;
                // console.log(this.addParamsForm.attr_name)
                const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addParamsForm.attr_name,
                    attr_sel:this.activeName
                });
                console.log('添加参数确定的请求',res);
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addParamsDialogVisible=false;
                this.getParamsData()
            })
            this.addParamsDialogVisible=false
        },
        // 点击按钮，展示修改操作的对话框
        async showEditParamsDialog(attr_id){
            // console.log('当前行的分类id',attr_id)
            // 根据id查询参数
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}});
            console.log('根据id查询参数的请求',res)
            if(res.meta.status!==200) return;
            this.editParamsForm=res.data;
            this.editParamsDialogVisible=true
        },
        // 监听修改参数对话框的关闭
        editParamsDialogClosed(){
            this.$refs.editParamsRef.resetFields()
        },
        // 修改参数，点击确定按钮提交
        editParamsConfirm(){
            this.$refs.editParamsRef.validate(async valid=>{
                // console.log(valid)
                if(!valid) return
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editParamsForm.attr_id}`,{attr_name:this.editParamsForm.attr_name,attr_sel:this.activeName});
                console.log('提交修改参数的确认按钮发起的请求',res)
                if(res.meta.status!==200){
                    return this.$messagr.error('修改参数失败')
                }
                this.$message.success('修改参数成功');
                this.editParamsDialogVisible=false;
                this.getParamsData()
            })
        },
        // 删除参数
        async removeParams(attr_id){
            // console.log(attr_id)
            const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
            if(res.meta.status!==200){
                return this.$message.error('删除参数失败')
            }
            // console.log('删除参数的请求',res);
            this.$message.success('删除参数成功');
            this.getParamsData()    
        },
        // 文本框失去焦点，或摁下了enter键都会触发这个函数
        async handleInputConfirm(row){
            // trim()去除字符串两端的空格
            if(row.inputValue.trim().length===0){
                row.inputValue='';
                row.inputVisible=false;
                // 无需再做后续处理
                return
            }
            // 如果没有return 则证明输入内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue='';
            row.inputVisible=false;
            this.saveAttrValus(row)
        },
        // 点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible=true;
            // 让文本框自动获得焦点
            // $nextTick的作用:当页面上的元素重新被渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的参数可选项
        handleClosed(i,row){
            // console.log(i,row);
            row.attr_vals.splice(i,1);
            this.saveAttrValus(row)
        },
        // 将对attr_vals的操作保存到数据库
        async saveAttrValus(row){
             // 需要发起请求，保存这一次操作
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            // console.log('保存添加参数的请求',res.data);
            if(res.meta.status!==200){
                return this.$message.error('添加参数项失败')
            }
            this.$message.success('添加参数项成功')
        }
    },
    computed:{
        // 如果按钮需要被禁用，则返回true,否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleTexe(){
            if(this.activeName==='many'){
                return '动态参数'
            };
            return '静态属性'
        }
    }
}
</script>
<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.input-new-tag{
    width: 120px;
}
.el-tag{
    margin:10px
}
</style>